Grepping the codebase for old TIMESTAMP() syntax realed the following lines:

./netware/static_init_db.sql:CREATE TABLE tables_priv (Host char(60) binary DEFAULT '' NOT NULL, Db char(64) binary DEFAULT '' NOT NULL, User char(16) binary DEFAULT '' NOT NULL, Table_name char(64) binary DEFAULT '' NOT NULL, Grantor char(77) DEFAULT '' NOT NULL, Timestamp timestamp(14), Table_priv set('Select','Insert','Update','Delete','Create','Drop','Grant','References','Index','Alter') DEFAULT '' NOT NULL, Column_priv set('Select','Insert','Update','References') DEFAULT '' NOT NULL, PRIMARY KEY (Host,Db,User,Table_name), KEY Grantor (Grantor)) comment='Table privileges';
./netware/static_init_db.sql:CREATE TABLE columns_priv (Host char(60) binary DEFAULT '' NOT NULL, Db char(64) binary DEFAULT '' NOT NULL, User char(16) binary DEFAULT '' NOT NULL, Table_name char(64) binary DEFAULT '' NOT NULL, Column_name char(64) binary DEFAULT '' NOT NULL, Timestamp timestamp(14), Column_priv set('Select','Insert','Update','References') DEFAULT '' NOT NULL, PRIMARY KEY (Host,Db,User,Table_name,Column_name)) comment='Column privileges';

not sure if those are still relevant.